Flexible Hollow Core Fiber Photoacoustic Gas Sensor Based on Embedded Acoustic Resonant Structure

Zhang, Bo; Jiang, Jiachen; Zhang, Xian; Zhu, Xiao-Song; Shi, Yiwei

doi:10.1021/acs.analchem.3c01476

Cited by 9 publications

(6 citation statements)

References 43 publications

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“…The Q-factor of the MDPAC is 30 through the frequency response curve. For the first-order resonant PAC, the resonant frequency f 1 is expressed as f 1 = v 2 ( L normalr + false( 8 d r / 3 π false) ) where v represents the propagation speed of the sound wave in the background gas. In the SF 6 background, the sound velocity v is about 135 m/s.…”

Section: Test Results and Data Analysismentioning

confidence: 99%

Fiber-Optic Photoacoustic CO Sensor for Gas Insulation Equipment Monitoring Based on Cantilever Differential Lock-In Amplification and Optical Excitation Enhancement

Zhao,

Ma,

Wang

et al. 2024

Anal. Chem.

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A fiber-optic photoacoustic CO sensor for gas insulation equipment is proposed, which relies on F−P interferometric cantilever-based differential lockin amplification and optical multipass excitation enhancement. The sensor has excellent characteristics of high sensitivity, antielectromagnetic interference, fast response, and long-distance detection. The photoacoustic pressure waves in the two resonators of the differential photoacoustic cell (DPAC) are simultaneously detected by two fiber-optic interferometric cantilevers and processed differentially; thereby, the gas flow noise is effectively suppressed. Based on the comprehensive analysis of the superposition of photoacoustic excitation and multipass absorption, the diameter of the resonator is determined to be 6 mm. The optical power emitted by the 1566.6 nm distributed feedback laser is increased to 500 mW by an erbium-doped fiber amplifier. The near-infrared light is reflected 30 times in the multipass cell, which improves the order of magnitude of optical effective excitation. Due to the low sound velocity of SF 6 gas, the resonant frequency of the DPAC with a resonator length of 80 mm is 760 Hz. The response time to CO/SF 6 gas is 93 s with a flow rate of 500 sccm. The detection limit of the CO sensor is 53 ppb, which realizes the accurate and timely perception of the SF 6 decomposition derivative CO and provides technical support for trouble-free operation of gas insulation equipment.

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Section: Test Results and Data Analysismentioning

confidence: 99%

Fiber-Optic Photoacoustic CO Sensor for Gas Insulation Equipment Monitoring Based on Cantilever Differential Lock-In Amplification and Optical Excitation Enhancement

Zhao,

Ma,

Wang

et al. 2024

Anal. Chem.

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show abstract

“…Photoacoustic (PA) spectroscopy (PAS) is one of the key sensitive gas analysis technologies. − Compared with direct absorption spectroscopy, − it has the characteristics of no background, which is beneficial to improve the sensitivity of gas detection. , Among various PAS systems, − the fiber-optic PA sensor uses a fiber interferometers to detect PA signals, which has the advantage of intrinsic safety. − The fiber-optic PA sensor based on the extrinsic Fabry–Perot (F–P) interference (EFPI) has the characteristic of a simple structure andrealizes the high-sensitive detection of the PA signal. − However, when the fiber-optic PA sensor is installed into the traditional resonant PA cell, the volume of the gas chamber is very large. According to the basic principle of PA gas detection, the PA signal is enhanced with a decrease in the volume of the gas chamber.…”

mentioning

confidence: 99%

High-Precision Multipass Fiber-Optic Photoacoustic Gas Analyzer Based on 2f/1f Wavelength Modulation Spectroscopy

Xu,

Wang,

et al. 2024

Anal. Chem.

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“…The gas consumption of the PAS systems was relatively large, which led to the systems being unsuitable for gas leak detection in small areas and low gas consumption detection. Zhang et al demonstrated a flexible PA gas sensor employing a piece of hollow core fiber, which reduced the spatial size. , The large core leaky hollow core fiber was conducted parameter optimization to realize the diffusion detection with the advantages of compact size, high cell constant, and low loss.…”

mentioning

confidence: 99%

Differential Cantilever Enhanced Fiber-Optic Photoacoustic Sensor for Diffusion Gas Detection

Li,

Zhang,

Guo

et al. 2024

Anal. Chem.

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Aiming at the problem of the fiber-optic photoacoustic (PA) sensor being easily disturbed by external vibration and noise, a differential cantilever enhanced fiber-optic PA sensor is proposed for diffusion gas detection. The sensor comprises two PA tubes with the same structure and a pair of differential interferometric cantilevers. The two PA tubes are symmetrically distributed. The laser is incident on the PA tube as the signal channel to excite the PA pressure wave. Another tube without incident laser is used as the reference channel to suppress external disturbance. The external interference signals and PA signals superimposed with disturbance are detected by the differential cantilevers from the two channels. The signals are simultaneously restored by a single white-light interferometry demodulator, which multiplexed the spectral frequency domain of the superimposed interference spectrum. The experimental results show that the suppression effect of the differential cantilever enhanced PA sensor on ambient noise is improved by 80%, compared to the traditional singlecantilever sensor. The external cofrequency disturbance is suppressed by 20.9 dB. The minimum detection limit to acetylene (C 2 H 2 ) downs to about 60 ppb with an integration time of 100 s. The sensor has excellent antivibration and electromagnetic interference ability.

show abstract

Flexible Hollow Core Fiber Photoacoustic Gas Sensor Based on Embedded Acoustic Resonant Structure

Cited by 9 publications

References 43 publications

Fiber-Optic Photoacoustic CO Sensor for Gas Insulation Equipment Monitoring Based on Cantilever Differential Lock-In Amplification and Optical Excitation Enhancement

Fiber-Optic Photoacoustic CO Sensor for Gas Insulation Equipment Monitoring Based on Cantilever Differential Lock-In Amplification and Optical Excitation Enhancement

High-Precision Multipass Fiber-Optic Photoacoustic Gas Analyzer Based on 2f/1f Wavelength Modulation Spectroscopy

Differential Cantilever Enhanced Fiber-Optic Photoacoustic Sensor for Diffusion Gas Detection

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